文献类型：期刊文献

英文题名：Comparison of anatomical characteristics and chemical compositions between sapwood and heartwood of Michelia macclurei

作者：Ren, Suhong[1] Wang, Zhiping[1] Yan, Lirong[1] Feng, Qiming[1] Chen, Zhangjing[2] Zhao, Rongjun[1]

第一作者：Ren, Suhong

通信作者：Zhao, RJ[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Dept Wood Mech & Wood Struct, Beijing 100091, Peoples R China;[2]Virginia Polytech Inst & State Univ, Dept Sustainable Biomat, Blacksburg, VA 24060 USA

年份：2023

卷号：193

外文期刊名：INDUSTRIAL CROPS AND PRODUCTS

收录：;EI(收录号：20225313321735);Scopus(收录号：2-s2.0-85144821560);WOS:【SCI-EXPANDED(收录号:WOS:001071290500001)】；

基金：This study was supported by the National Natural Science Foundation of China (No. 32171711).

语种：英文

外文关键词：Heartwood; Sapwood; Anatomical characteristics; Chemical compositions; Michelia macclurei Dandy

摘要：Understanding the anatomical and chemical properties of sapwood and heartwood is important for the utilization of wood. In this study, the anatomical characteristics and chemical compositions of sapwood (SW) and heartwood (HW) of Michelia macclurei Dandy were investigated and compared. Six locations at SW and HW were selected and studied. The wet chemical method and Fourier Transform Infrared Spectroscopy (FTIR) technology were used to analyze the chemical compositions in SW and HW. The results showed that the fiber wall thickness, fiber lumen diameter, fiber wall thickness-to-lumen ratio, vessel lumen diameter and vessel frequency were significantly different between SW and HW. However, the ray frequency did not differ significantly between SW and HW. Less lignin (22.42%) in HW than SW (25.56%), proved that cell walls in HW were not completely lignified. As the heartwood accumulated substances, the extractives in HW was significantly higher than SW. The FTIR relative absorbance of 1502 cm(-1) of lignin decreased from SW to HW. The two-dimensional heteronuclear single-quantum coherence (2D-HSQC) NMR spectra showed that the main lignin substructure, beta-O-4' aryl ether, was higher in SW (66.99%) than HW (58.22%). The S/G ratio in SW was about 1.8 times higher than that in HW, indicating that SW had more S-lignin. The alkaloids, a class of antifungal extractives of Michelia, were found to be mainly present in HW. These results contribute to a better understanding of sapwood and heartwood properties, which is of value for the further utilization of Michelia macclurei Dandy.